On-field hashtags in college football have gained in popularity since the first one appeared in the end zone at Mississippi State's Davis Wade Stadium in November 2011. Typically, it's used by mascots or the school as a rallying cry, but corporations could easily get in the act.

The new rule also prohibits website URLs on the field. Other rules stipulate that jersey numbers must have a distinct color from the jersey itself, and eye shields, including glasses and goggles must be clear and not tinted.

"Except as noted herein, there may be no advertising on the field, which includes the end zones and sideline areas," according to a memo from the NCAA's Football Rules Committee.

Exceptions to this include the NCAA logo, school logos, conference logos and the names of commercial sponsors.

Israeli Prime Minister Benjamin Netanyahu warned Tuesday that a proposed agreement between world powers and Iran was "a bad deal" that would not stop Tehran from getting nuclear weapons -- but would rather pave its way to getting lots of them and lea...